1. I have sent those letters this week/morning. I have just sent those letters. (Present Perfect) I sent those letters yesterday/a fortnight ago/last week. (Past Simple) 2. We have gone shopping today/this week. We have already gone shopping. (Present Perfect) We went shopping three days ago/ last month/the other day). (Past Simple) 3. They were in Kiev last year/2 years ago/ last Sunday. (Past Simple) They have been in Kiev lately/this month. (Present Perfect)
I sent those letters yesterday/a fortnight ago/last week. (Past Simple)
2. We have gone shopping today/this week. We have already gone shopping. (Present Perfect)
We went shopping three days ago/ last month/the other day). (Past Simple)
3. They were in Kiev last year/2 years ago/ last Sunday. (Past Simple)
They have been in Kiev lately/this month. (Present Perfect)